Patent US3348948A successfully refreshed from Google Patents.
US3348948A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Presensitized deep etch lithographic plates
Assignee: Litho Chemical and Supply Co Inc
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Filing: 1964-03-11
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Granted: 1967-10-24
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Expires: 1984-03-11
Abstract
No abstract record available.
Inventors
- 👤 Robert F Leonard
- 👤 Beckett Madeline
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:15
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/008
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
77 words
A PRESENSITIZED DEEP ETCH LITHOGRAPHIC PLATE WHICH RETAINS ITS PHOTOGRAPHIC SENSITIVITY WHEN STORED FOR A PROLONGED PERIOD OF TIME, COMPRISING A METAL PLATE HAVING ON AT LEAST ONE SURFACE THEREOF A COATING OF A DIAZIDOPOLYVINYLPYRROLIDONE SENSITIZER COMPOSED OF THE FOLLOWING CONSTITUENTS IN THE FOLLOWING AMOUNTS WITH IN A $10% TOLERANCE: PERCENT WATER (DISTILLED) 93.19 POLYVINYLPYRROLIDONE K-90 4.47 POLYRACRYLIC ACID (M.W. 95,000) 0.51 TANNIC ACID 0.25 SODIUM SALT OF 4,4''-DIAZIDOSTILBENE-2,2''-DISULFONIC ACID 0.99 SODIUM AZIDE 0.33 WETTING AGENT 0.25
Claim 2
Dependent Claim
77 words
A PRESENSITIZED DEEP ETCH LITHOGRAPHIC PLATE WHICH RETAINS ITS PHOTOGRAPHIC SENSITIVITY WHEN STORED FOR A PROLONGED PERIOD OF TIME, COMPRISING A METAL PLATE HAVING ON AT LEAST ONE SURFACE THEREOF A COATING OF A DIAZIDOPOLYVINYLPYRROLIDONE SENSITIZER COMPOSED OF THE FOLLOWING CONSTITUENTS IN THE FOLLOWING AMOUNTS WITH IN A $10% TOLERANCE: PERCENT WATER (DISTILLED) 93.19 POLYVINYLPYRROLIDONE K-90 4.47 POLYRACRYLIC ACID (M.W. 95,000) 0.51 TANNIC ACID 0.25 SODIUM SALT OF 4,4''-DIAZIDOSTILBENE-2,2''-DISULFONIC ACID 0.99 SODIUM AZIDE 0.33 WETTING AGENT 0.25
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-10-23 | 1971-04-24 | 1971-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-23 | 1975-04-24 | 1975-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-23 | 1979-04-24 | 1979-10-24 | $7700.00 | Window Closed / Lapsed |